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Home All issues Volume 498 / No 2 (May I 2009) A&A, 498 2 (2009) 509-516 Full HTML
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Table 1:

Best-fit parameters of the multi-component model WABS(C OMPTB + C OMPTB + Gaussian).
Parameter UHB LHB UNB MNB LNB
$N_{\rm H}^{a}$ [0.15] [0.15] [0.15] [0.15] [0.15]
C OMPTB (thermal: $\log$[A]=8, $\delta$=0)
$kT_{\rm s}$ (keV) $\rm0.28^{+ 0.02}_{- 0.03}$ $\rm0.29^{+ 0.02}_{-0.02}$ $\rm0.31^{+0.01}_{-0.01}$ $\rm0.30^{+ 0.01}_{-0.01}$ $\rm0.31^{+0.01}_{-0.01}$
$kT_{\rm e}\ $ (keV) $\rm 2.72^{+ 0.06}_{-0.08}$ $\rm 2.65^{+ 0.08}_{-0.10}$ $\rm 2.41^{+0.04}_{-0.04}$ $\rm 2.23^{+0.06}_{-0.05}$ $\rm 2.51^{+ 0.06}_{-0.08}$
$\alpha$ $\rm0.80^{+0.03}_{-0.03}$ $\rm0.82^{+0.07}_{-0.03}$ $\rm0.80^{+0.03}_{-0.03}$ $\rm0.82^{+ 0.04}_{-0.04}$ $\rm 1.00^{+0.08}_{-0.02}$
$\tau^{b}$ 6.5 6.4 6.9 7.1 5.8
$\rm CAF^{c}$ 2.8 2.6 2.5 2.4 2.2

C OMPTB
$kT_{\rm s}$ (keV) $\rm 1.00^{+0.08}_{-0.11}$ $\rm 1.15^{+0.05}_{-0.14}$ $\rm 1.11^{+0.02}_{-0.02}$ $\rm 1.08^{+0.03}_{-0.03}$ $\rm 1.16^{+ 0.03}_{-0.04}$
$R_{\rm bb}^d$ (km) 3.4 3.2 4.6 4.9 4.6
$kT_{\rm e}\ $ (keV) [ $kT_{\rm e}\ $] [ $kT_{\rm e}\ $] [ $kT_{\rm e}\ $] [ $kT_{\rm e}\ $] -
$\log(A)$ 0.11 (>-0.12) -0.40 (>-0.65) [-0.4] [-0.4] [-8]
$\alpha$ [2.5] [2.5] [2.5] [2.5] -
$\delta$ 75 (>40) $\rm 49^{+ 39}_{- 18}$ $\rm 25^{+ 5}_{-4}$ $\rm 22^{+5}_{-4}$ -
Gaussian
El (keV) $\rm 6.8^{+ 0.1}_{- 0.1}$ 6.7 $\rm ^{+ 0.1}_{- 0.1}$ $\rm 6.7^{+ 0.1}_{-0.1}$ $\rm 6.6^{+ 0.1}_{-0.1}$ $\rm 6.7^{+ 0.1}_{-0.1}$
$\sigma_{l}$ (keV) $\rm0.3^{+ 0.2}_{- 0.1}$ 0.2 (<0.3) 0.1 (<0.2) 0.12 (<0.2) 0.1  (<0.2)
Il $\rm 2.5^{+ 0.9}_{- 0.7}$ $\rm 1.4^{+0.7}_{-0.6}$ $\rm 1.9^{+0.7}_{-0.7}$ $\rm 1.8^{+0.9}_{-0.8}$ $\rm 3.0^{+1.7}_{-0.9}$
EWl (eV) $\rm 38^{+ 18}_{-9}$ $\rm 17^{+8}_{-8}$ $\rm 15^{+5}_{-5}$ $\rm 14^{+7}_{-6}$ $\rm 29^{+16}_{-9}$
$L_{\rm bb}^e/L_{\rm tot} $ 0.25 0.26 0.25 0.25 0.28
$L_{\rm th}^f/L_{\rm tot} $ 0.69 0.67 0.63 0.61 0.63
$L_{\rm tot}^{\rm g} $ 0.9 1.1 1.7 1.7 1.5
$\chi^2$/d.o.f. 175/152 162/154 159/148 185/144 197/143
Errors are computed at 90% confidence level for a single parameter. Additional emission lines at $\sim $1 keV and $\sim $2.5 keV were included in all the five spectra (see Sect. 2). a In units of 1022 cm-2; b computed from $kT_{\rm e}\ $ and $\alpha$ using Eqs. [17] and [24] for slab geometry in Titarchuk & Lyubarskij (1995); c Compton Amplification Factor (see text for the definition); d computed using the simple relation $L = 4\pi \sigma R^2 T^4$; e ratio between the direct BB component flux of the second C OMPTB and the total flux in the 0.1-200 keV energy range; f ratio between the TC component flux and the total flux in the 0.1-200 keV energy range; g in units of 1038 erg s-1 computed in the energy range 0.1-200 keV assuming a source distance of 8 kpc.

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